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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/arch/arm/common/amba.c | |
3 | * | |
4 | * Copyright (C) 2003 Deep Blue Solutions Ltd, All Rights Reserved. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | */ | |
10 | #include <linux/module.h> | |
11 | #include <linux/init.h> | |
12 | #include <linux/device.h> | |
4e57b681 TS |
13 | #include <linux/string.h> |
14 | #include <linux/slab.h> | |
934848da | 15 | #include <linux/io.h> |
ba74ec7f RV |
16 | #include <linux/pm.h> |
17 | #include <linux/pm_runtime.h> | |
f48c767c | 18 | #include <linux/pm_domain.h> |
a62c80e5 | 19 | #include <linux/amba/bus.h> |
a875cfbb | 20 | #include <linux/sizes.h> |
1da177e4 | 21 | |
934848da | 22 | #include <asm/irq.h> |
1da177e4 | 23 | |
1da177e4 LT |
24 | #define to_amba_driver(d) container_of(d, struct amba_driver, drv) |
25 | ||
c862aab0 RK |
26 | static const struct amba_id * |
27 | amba_lookup(const struct amba_id *table, struct amba_device *dev) | |
1da177e4 LT |
28 | { |
29 | int ret = 0; | |
30 | ||
31 | while (table->mask) { | |
32 | ret = (dev->periphid & table->mask) == table->id; | |
33 | if (ret) | |
34 | break; | |
35 | table++; | |
36 | } | |
37 | ||
38 | return ret ? table : NULL; | |
39 | } | |
40 | ||
41 | static int amba_match(struct device *dev, struct device_driver *drv) | |
42 | { | |
43 | struct amba_device *pcdev = to_amba_device(dev); | |
44 | struct amba_driver *pcdrv = to_amba_driver(drv); | |
45 | ||
46 | return amba_lookup(pcdrv->id_table, pcdev) != NULL; | |
47 | } | |
48 | ||
7eff2e7a | 49 | static int amba_uevent(struct device *dev, struct kobj_uevent_env *env) |
1da177e4 LT |
50 | { |
51 | struct amba_device *pcdev = to_amba_device(dev); | |
7eff2e7a | 52 | int retval = 0; |
1da177e4 | 53 | |
7eff2e7a | 54 | retval = add_uevent_var(env, "AMBA_ID=%08x", pcdev->periphid); |
523817bd DM |
55 | if (retval) |
56 | return retval; | |
57 | ||
58 | retval = add_uevent_var(env, "MODALIAS=amba:d%08X", pcdev->periphid); | |
bf62456e | 59 | return retval; |
1da177e4 | 60 | } |
1da177e4 | 61 | |
96b13f5c RK |
62 | #define amba_attr_func(name,fmt,arg...) \ |
63 | static ssize_t name##_show(struct device *_dev, \ | |
64 | struct device_attribute *attr, char *buf) \ | |
65 | { \ | |
66 | struct amba_device *dev = to_amba_device(_dev); \ | |
67 | return sprintf(buf, fmt, arg); \ | |
68 | } | |
69 | ||
70 | #define amba_attr(name,fmt,arg...) \ | |
71 | amba_attr_func(name,fmt,arg) \ | |
72 | static DEVICE_ATTR(name, S_IRUGO, name##_show, NULL) | |
73 | ||
74 | amba_attr_func(id, "%08x\n", dev->periphid); | |
75 | amba_attr(irq0, "%u\n", dev->irq[0]); | |
76 | amba_attr(irq1, "%u\n", dev->irq[1]); | |
77 | amba_attr_func(resource, "\t%016llx\t%016llx\t%016lx\n", | |
78 | (unsigned long long)dev->res.start, (unsigned long long)dev->res.end, | |
79 | dev->res.flags); | |
80 | ||
81 | static struct device_attribute amba_dev_attrs[] = { | |
82 | __ATTR_RO(id), | |
83 | __ATTR_RO(resource), | |
84 | __ATTR_NULL, | |
85 | }; | |
86 | ||
f210c53a | 87 | #ifdef CONFIG_PM |
92b97f0a RK |
88 | /* |
89 | * Hooks to provide runtime PM of the pclk (bus clock). It is safe to | |
90 | * enable/disable the bus clock at runtime PM suspend/resume as this | |
1e45860f | 91 | * does not result in loss of context. |
92b97f0a RK |
92 | */ |
93 | static int amba_pm_runtime_suspend(struct device *dev) | |
94 | { | |
95 | struct amba_device *pcdev = to_amba_device(dev); | |
96 | int ret = pm_generic_runtime_suspend(dev); | |
97 | ||
98 | if (ret == 0 && dev->driver) | |
5303c0f4 | 99 | clk_disable_unprepare(pcdev->pclk); |
92b97f0a RK |
100 | |
101 | return ret; | |
102 | } | |
103 | ||
104 | static int amba_pm_runtime_resume(struct device *dev) | |
105 | { | |
106 | struct amba_device *pcdev = to_amba_device(dev); | |
107 | int ret; | |
108 | ||
109 | if (dev->driver) { | |
5303c0f4 | 110 | ret = clk_prepare_enable(pcdev->pclk); |
92b97f0a RK |
111 | /* Failure is probably fatal to the system, but... */ |
112 | if (ret) | |
113 | return ret; | |
114 | } | |
115 | ||
116 | return pm_generic_runtime_resume(dev); | |
117 | } | |
118 | #endif | |
119 | ||
ba74ec7f | 120 | static const struct dev_pm_ops amba_pm = { |
26825cfd UH |
121 | .suspend = pm_generic_suspend, |
122 | .resume = pm_generic_resume, | |
123 | .freeze = pm_generic_freeze, | |
124 | .thaw = pm_generic_thaw, | |
125 | .poweroff = pm_generic_poweroff, | |
126 | .restore = pm_generic_restore, | |
6ed23b80 | 127 | SET_RUNTIME_PM_OPS( |
92b97f0a RK |
128 | amba_pm_runtime_suspend, |
129 | amba_pm_runtime_resume, | |
45f0a85c | 130 | NULL |
ba74ec7f RV |
131 | ) |
132 | }; | |
133 | ||
1da177e4 LT |
134 | /* |
135 | * Primecells are part of the Advanced Microcontroller Bus Architecture, | |
136 | * so we call the bus "amba". | |
137 | */ | |
394d5aef | 138 | struct bus_type amba_bustype = { |
1da177e4 | 139 | .name = "amba", |
96b13f5c | 140 | .dev_attrs = amba_dev_attrs, |
1da177e4 | 141 | .match = amba_match, |
6d20b035 | 142 | .uevent = amba_uevent, |
26825cfd | 143 | .pm = &amba_pm, |
1da177e4 LT |
144 | }; |
145 | ||
146 | static int __init amba_init(void) | |
147 | { | |
148 | return bus_register(&amba_bustype); | |
149 | } | |
150 | ||
151 | postcore_initcall(amba_init); | |
152 | ||
7cfe2494 RK |
153 | static int amba_get_enable_pclk(struct amba_device *pcdev) |
154 | { | |
7cfe2494 RK |
155 | int ret; |
156 | ||
89a5c985 UH |
157 | pcdev->pclk = clk_get(&pcdev->dev, "apb_pclk"); |
158 | if (IS_ERR(pcdev->pclk)) | |
159 | return PTR_ERR(pcdev->pclk); | |
7cfe2494 | 160 | |
89a5c985 UH |
161 | ret = clk_prepare_enable(pcdev->pclk); |
162 | if (ret) | |
163 | clk_put(pcdev->pclk); | |
7cfe2494 RK |
164 | |
165 | return ret; | |
166 | } | |
167 | ||
168 | static void amba_put_disable_pclk(struct amba_device *pcdev) | |
169 | { | |
89a5c985 UH |
170 | clk_disable_unprepare(pcdev->pclk); |
171 | clk_put(pcdev->pclk); | |
7cfe2494 RK |
172 | } |
173 | ||
1da177e4 LT |
174 | /* |
175 | * These are the device model conversion veneers; they convert the | |
176 | * device model structures to our more specific structures. | |
177 | */ | |
178 | static int amba_probe(struct device *dev) | |
179 | { | |
180 | struct amba_device *pcdev = to_amba_device(dev); | |
181 | struct amba_driver *pcdrv = to_amba_driver(dev->driver); | |
c862aab0 | 182 | const struct amba_id *id = amba_lookup(pcdrv->id_table, pcdev); |
7cfe2494 | 183 | int ret; |
1da177e4 | 184 | |
7cfe2494 | 185 | do { |
207f1a2d UH |
186 | ret = dev_pm_domain_attach(dev, true); |
187 | if (ret == -EPROBE_DEFER) | |
188 | break; | |
189 | ||
7cfe2494 | 190 | ret = amba_get_enable_pclk(pcdev); |
207f1a2d UH |
191 | if (ret) { |
192 | dev_pm_domain_detach(dev, true); | |
7cfe2494 | 193 | break; |
207f1a2d | 194 | } |
7cfe2494 | 195 | |
92b97f0a RK |
196 | pm_runtime_get_noresume(dev); |
197 | pm_runtime_set_active(dev); | |
198 | pm_runtime_enable(dev); | |
199 | ||
7cfe2494 RK |
200 | ret = pcdrv->probe(pcdev, id); |
201 | if (ret == 0) | |
202 | break; | |
1da177e4 | 203 | |
92b97f0a RK |
204 | pm_runtime_disable(dev); |
205 | pm_runtime_set_suspended(dev); | |
206 | pm_runtime_put_noidle(dev); | |
207 | ||
7cfe2494 | 208 | amba_put_disable_pclk(pcdev); |
207f1a2d | 209 | dev_pm_domain_detach(dev, true); |
7cfe2494 RK |
210 | } while (0); |
211 | ||
212 | return ret; | |
1da177e4 LT |
213 | } |
214 | ||
215 | static int amba_remove(struct device *dev) | |
216 | { | |
7cfe2494 | 217 | struct amba_device *pcdev = to_amba_device(dev); |
1da177e4 | 218 | struct amba_driver *drv = to_amba_driver(dev->driver); |
92b97f0a RK |
219 | int ret; |
220 | ||
221 | pm_runtime_get_sync(dev); | |
222 | ret = drv->remove(pcdev); | |
223 | pm_runtime_put_noidle(dev); | |
224 | ||
225 | /* Undo the runtime PM settings in amba_probe() */ | |
226 | pm_runtime_disable(dev); | |
227 | pm_runtime_set_suspended(dev); | |
228 | pm_runtime_put_noidle(dev); | |
7cfe2494 RK |
229 | |
230 | amba_put_disable_pclk(pcdev); | |
207f1a2d | 231 | dev_pm_domain_detach(dev, true); |
7cfe2494 RK |
232 | |
233 | return ret; | |
1da177e4 LT |
234 | } |
235 | ||
236 | static void amba_shutdown(struct device *dev) | |
237 | { | |
238 | struct amba_driver *drv = to_amba_driver(dev->driver); | |
239 | drv->shutdown(to_amba_device(dev)); | |
240 | } | |
241 | ||
242 | /** | |
243 | * amba_driver_register - register an AMBA device driver | |
244 | * @drv: amba device driver structure | |
245 | * | |
246 | * Register an AMBA device driver with the Linux device model | |
247 | * core. If devices pre-exist, the drivers probe function will | |
248 | * be called. | |
249 | */ | |
250 | int amba_driver_register(struct amba_driver *drv) | |
251 | { | |
252 | drv->drv.bus = &amba_bustype; | |
253 | ||
254 | #define SETFN(fn) if (drv->fn) drv->drv.fn = amba_##fn | |
255 | SETFN(probe); | |
256 | SETFN(remove); | |
257 | SETFN(shutdown); | |
258 | ||
259 | return driver_register(&drv->drv); | |
260 | } | |
261 | ||
262 | /** | |
263 | * amba_driver_unregister - remove an AMBA device driver | |
264 | * @drv: AMBA device driver structure to remove | |
265 | * | |
266 | * Unregister an AMBA device driver from the Linux device | |
267 | * model. The device model will call the drivers remove function | |
268 | * for each device the device driver is currently handling. | |
269 | */ | |
270 | void amba_driver_unregister(struct amba_driver *drv) | |
271 | { | |
272 | driver_unregister(&drv->drv); | |
273 | } | |
274 | ||
275 | ||
276 | static void amba_device_release(struct device *dev) | |
277 | { | |
278 | struct amba_device *d = to_amba_device(dev); | |
279 | ||
280 | if (d->res.parent) | |
281 | release_resource(&d->res); | |
282 | kfree(d); | |
283 | } | |
284 | ||
1da177e4 | 285 | /** |
d5dc9271 RK |
286 | * amba_device_add - add a previously allocated AMBA device structure |
287 | * @dev: AMBA device allocated by amba_device_alloc | |
288 | * @parent: resource parent for this devices resources | |
1da177e4 | 289 | * |
d5dc9271 RK |
290 | * Claim the resource, and read the device cell ID if not already |
291 | * initialized. Register the AMBA device with the Linux device | |
292 | * manager. | |
1da177e4 | 293 | */ |
d5dc9271 | 294 | int amba_device_add(struct amba_device *dev, struct resource *parent) |
1da177e4 | 295 | { |
8afe0b96 | 296 | u32 size; |
1da177e4 LT |
297 | void __iomem *tmp; |
298 | int i, ret; | |
299 | ||
2eac58d5 RK |
300 | WARN_ON(dev->irq[0] == (unsigned int)-1); |
301 | WARN_ON(dev->irq[1] == (unsigned int)-1); | |
302 | ||
1da177e4 | 303 | ret = request_resource(parent, &dev->res); |
96b13f5c RK |
304 | if (ret) |
305 | goto err_out; | |
306 | ||
97ceed1f LW |
307 | /* Hard-coded primecell ID instead of plug-n-play */ |
308 | if (dev->periphid != 0) | |
309 | goto skip_probe; | |
310 | ||
8afe0b96 LC |
311 | /* |
312 | * Dynamically calculate the size of the resource | |
313 | * and use this for iomap | |
314 | */ | |
315 | size = resource_size(&dev->res); | |
316 | tmp = ioremap(dev->res.start, size); | |
96b13f5c RK |
317 | if (!tmp) { |
318 | ret = -ENOMEM; | |
319 | goto err_release; | |
1da177e4 | 320 | } |
96b13f5c | 321 | |
7cfe2494 RK |
322 | ret = amba_get_enable_pclk(dev); |
323 | if (ret == 0) { | |
324 | u32 pid, cid; | |
96b13f5c | 325 | |
7cfe2494 RK |
326 | /* |
327 | * Read pid and cid based on size of resource | |
328 | * they are located at end of region | |
329 | */ | |
330 | for (pid = 0, i = 0; i < 4; i++) | |
331 | pid |= (readl(tmp + size - 0x20 + 4 * i) & 255) << | |
332 | (i * 8); | |
333 | for (cid = 0, i = 0; i < 4; i++) | |
334 | cid |= (readl(tmp + size - 0x10 + 4 * i) & 255) << | |
335 | (i * 8); | |
96b13f5c | 336 | |
7cfe2494 | 337 | amba_put_disable_pclk(dev); |
96b13f5c | 338 | |
01723a95 | 339 | if (cid == AMBA_CID) |
7cfe2494 RK |
340 | dev->periphid = pid; |
341 | ||
342 | if (!dev->periphid) | |
343 | ret = -ENODEV; | |
96b13f5c RK |
344 | } |
345 | ||
7cfe2494 RK |
346 | iounmap(tmp); |
347 | ||
348 | if (ret) | |
349 | goto err_release; | |
350 | ||
97ceed1f | 351 | skip_probe: |
557dca5f | 352 | ret = device_add(&dev->dev); |
96b13f5c RK |
353 | if (ret) |
354 | goto err_release; | |
355 | ||
dfb85185 | 356 | if (dev->irq[0]) |
96b13f5c | 357 | ret = device_create_file(&dev->dev, &dev_attr_irq0); |
dfb85185 | 358 | if (ret == 0 && dev->irq[1]) |
96b13f5c RK |
359 | ret = device_create_file(&dev->dev, &dev_attr_irq1); |
360 | if (ret == 0) | |
361 | return ret; | |
362 | ||
363 | device_unregister(&dev->dev); | |
364 | ||
365 | err_release: | |
366 | release_resource(&dev->res); | |
367 | err_out: | |
1da177e4 LT |
368 | return ret; |
369 | } | |
d5dc9271 RK |
370 | EXPORT_SYMBOL_GPL(amba_device_add); |
371 | ||
6026aa90 LW |
372 | static struct amba_device * |
373 | amba_aphb_device_add(struct device *parent, const char *name, | |
374 | resource_size_t base, size_t size, int irq1, int irq2, | |
3ad909bc LW |
375 | void *pdata, unsigned int periphid, u64 dma_mask, |
376 | struct resource *resbase) | |
6026aa90 LW |
377 | { |
378 | struct amba_device *dev; | |
379 | int ret; | |
380 | ||
381 | dev = amba_device_alloc(name, base, size); | |
382 | if (!dev) | |
383 | return ERR_PTR(-ENOMEM); | |
384 | ||
6026aa90 LW |
385 | dev->dev.coherent_dma_mask = dma_mask; |
386 | dev->irq[0] = irq1; | |
387 | dev->irq[1] = irq2; | |
388 | dev->periphid = periphid; | |
389 | dev->dev.platform_data = pdata; | |
390 | dev->dev.parent = parent; | |
391 | ||
3ad909bc | 392 | ret = amba_device_add(dev, resbase); |
6026aa90 LW |
393 | if (ret) { |
394 | amba_device_put(dev); | |
395 | return ERR_PTR(ret); | |
396 | } | |
397 | ||
398 | return dev; | |
399 | } | |
400 | ||
401 | struct amba_device * | |
402 | amba_apb_device_add(struct device *parent, const char *name, | |
403 | resource_size_t base, size_t size, int irq1, int irq2, | |
404 | void *pdata, unsigned int periphid) | |
405 | { | |
406 | return amba_aphb_device_add(parent, name, base, size, irq1, irq2, pdata, | |
3ad909bc | 407 | periphid, 0, &iomem_resource); |
6026aa90 LW |
408 | } |
409 | EXPORT_SYMBOL_GPL(amba_apb_device_add); | |
410 | ||
411 | struct amba_device * | |
412 | amba_ahb_device_add(struct device *parent, const char *name, | |
413 | resource_size_t base, size_t size, int irq1, int irq2, | |
414 | void *pdata, unsigned int periphid) | |
415 | { | |
416 | return amba_aphb_device_add(parent, name, base, size, irq1, irq2, pdata, | |
3ad909bc | 417 | periphid, ~0ULL, &iomem_resource); |
6026aa90 LW |
418 | } |
419 | EXPORT_SYMBOL_GPL(amba_ahb_device_add); | |
420 | ||
3ad909bc LW |
421 | struct amba_device * |
422 | amba_apb_device_add_res(struct device *parent, const char *name, | |
423 | resource_size_t base, size_t size, int irq1, | |
424 | int irq2, void *pdata, unsigned int periphid, | |
425 | struct resource *resbase) | |
426 | { | |
427 | return amba_aphb_device_add(parent, name, base, size, irq1, irq2, pdata, | |
428 | periphid, 0, resbase); | |
429 | } | |
430 | EXPORT_SYMBOL_GPL(amba_apb_device_add_res); | |
431 | ||
432 | struct amba_device * | |
433 | amba_ahb_device_add_res(struct device *parent, const char *name, | |
434 | resource_size_t base, size_t size, int irq1, | |
435 | int irq2, void *pdata, unsigned int periphid, | |
436 | struct resource *resbase) | |
437 | { | |
438 | return amba_aphb_device_add(parent, name, base, size, irq1, irq2, pdata, | |
439 | periphid, ~0ULL, resbase); | |
440 | } | |
441 | EXPORT_SYMBOL_GPL(amba_ahb_device_add_res); | |
442 | ||
443 | ||
d5dc9271 RK |
444 | static void amba_device_initialize(struct amba_device *dev, const char *name) |
445 | { | |
446 | device_initialize(&dev->dev); | |
447 | if (name) | |
448 | dev_set_name(&dev->dev, "%s", name); | |
449 | dev->dev.release = amba_device_release; | |
450 | dev->dev.bus = &amba_bustype; | |
446b2a93 | 451 | dev->dev.dma_mask = &dev->dev.coherent_dma_mask; |
d5dc9271 RK |
452 | dev->res.name = dev_name(&dev->dev); |
453 | } | |
454 | ||
455 | /** | |
456 | * amba_device_alloc - allocate an AMBA device | |
457 | * @name: sysfs name of the AMBA device | |
458 | * @base: base of AMBA device | |
459 | * @size: size of AMBA device | |
460 | * | |
461 | * Allocate and initialize an AMBA device structure. Returns %NULL | |
462 | * on failure. | |
463 | */ | |
464 | struct amba_device *amba_device_alloc(const char *name, resource_size_t base, | |
465 | size_t size) | |
466 | { | |
467 | struct amba_device *dev; | |
468 | ||
469 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
470 | if (dev) { | |
471 | amba_device_initialize(dev, name); | |
472 | dev->res.start = base; | |
473 | dev->res.end = base + size - 1; | |
474 | dev->res.flags = IORESOURCE_MEM; | |
475 | } | |
476 | ||
477 | return dev; | |
478 | } | |
479 | EXPORT_SYMBOL_GPL(amba_device_alloc); | |
480 | ||
481 | /** | |
482 | * amba_device_register - register an AMBA device | |
483 | * @dev: AMBA device to register | |
484 | * @parent: parent memory resource | |
485 | * | |
486 | * Setup the AMBA device, reading the cell ID if present. | |
487 | * Claim the resource, and register the AMBA device with | |
488 | * the Linux device manager. | |
489 | */ | |
490 | int amba_device_register(struct amba_device *dev, struct resource *parent) | |
491 | { | |
492 | amba_device_initialize(dev, dev->dev.init_name); | |
493 | dev->dev.init_name = NULL; | |
494 | ||
d5dc9271 RK |
495 | return amba_device_add(dev, parent); |
496 | } | |
497 | ||
498 | /** | |
499 | * amba_device_put - put an AMBA device | |
500 | * @dev: AMBA device to put | |
501 | */ | |
502 | void amba_device_put(struct amba_device *dev) | |
503 | { | |
504 | put_device(&dev->dev); | |
505 | } | |
506 | EXPORT_SYMBOL_GPL(amba_device_put); | |
1da177e4 LT |
507 | |
508 | /** | |
509 | * amba_device_unregister - unregister an AMBA device | |
510 | * @dev: AMBA device to remove | |
511 | * | |
512 | * Remove the specified AMBA device from the Linux device | |
513 | * manager. All files associated with this object will be | |
514 | * destroyed, and device drivers notified that the device has | |
515 | * been removed. The AMBA device's resources including | |
516 | * the amba_device structure will be freed once all | |
517 | * references to it have been dropped. | |
518 | */ | |
519 | void amba_device_unregister(struct amba_device *dev) | |
520 | { | |
521 | device_unregister(&dev->dev); | |
522 | } | |
523 | ||
524 | ||
525 | struct find_data { | |
526 | struct amba_device *dev; | |
527 | struct device *parent; | |
528 | const char *busid; | |
529 | unsigned int id; | |
530 | unsigned int mask; | |
531 | }; | |
532 | ||
533 | static int amba_find_match(struct device *dev, void *data) | |
534 | { | |
535 | struct find_data *d = data; | |
536 | struct amba_device *pcdev = to_amba_device(dev); | |
537 | int r; | |
538 | ||
539 | r = (pcdev->periphid & d->mask) == d->id; | |
540 | if (d->parent) | |
541 | r &= d->parent == dev->parent; | |
542 | if (d->busid) | |
9d6b4c82 | 543 | r &= strcmp(dev_name(dev), d->busid) == 0; |
1da177e4 LT |
544 | |
545 | if (r) { | |
546 | get_device(dev); | |
547 | d->dev = pcdev; | |
548 | } | |
549 | ||
550 | return r; | |
551 | } | |
552 | ||
553 | /** | |
554 | * amba_find_device - locate an AMBA device given a bus id | |
555 | * @busid: bus id for device (or NULL) | |
556 | * @parent: parent device (or NULL) | |
557 | * @id: peripheral ID (or 0) | |
558 | * @mask: peripheral ID mask (or 0) | |
559 | * | |
560 | * Return the AMBA device corresponding to the supplied parameters. | |
561 | * If no device matches, returns NULL. | |
562 | * | |
563 | * NOTE: When a valid device is found, its refcount is | |
564 | * incremented, and must be decremented before the returned | |
565 | * reference. | |
566 | */ | |
567 | struct amba_device * | |
568 | amba_find_device(const char *busid, struct device *parent, unsigned int id, | |
569 | unsigned int mask) | |
570 | { | |
571 | struct find_data data; | |
572 | ||
573 | data.dev = NULL; | |
574 | data.parent = parent; | |
575 | data.busid = busid; | |
576 | data.id = id; | |
577 | data.mask = mask; | |
578 | ||
579 | bus_for_each_dev(&amba_bustype, NULL, &data, amba_find_match); | |
580 | ||
581 | return data.dev; | |
582 | } | |
583 | ||
584 | /** | |
585 | * amba_request_regions - request all mem regions associated with device | |
586 | * @dev: amba_device structure for device | |
587 | * @name: name, or NULL to use driver name | |
588 | */ | |
589 | int amba_request_regions(struct amba_device *dev, const char *name) | |
590 | { | |
591 | int ret = 0; | |
8afe0b96 | 592 | u32 size; |
1da177e4 LT |
593 | |
594 | if (!name) | |
595 | name = dev->dev.driver->name; | |
596 | ||
8afe0b96 LC |
597 | size = resource_size(&dev->res); |
598 | ||
599 | if (!request_mem_region(dev->res.start, size, name)) | |
1da177e4 LT |
600 | ret = -EBUSY; |
601 | ||
602 | return ret; | |
603 | } | |
604 | ||
605 | /** | |
25985edc | 606 | * amba_release_regions - release mem regions associated with device |
1da177e4 LT |
607 | * @dev: amba_device structure for device |
608 | * | |
609 | * Release regions claimed by a successful call to amba_request_regions. | |
610 | */ | |
611 | void amba_release_regions(struct amba_device *dev) | |
612 | { | |
8afe0b96 LC |
613 | u32 size; |
614 | ||
615 | size = resource_size(&dev->res); | |
616 | release_mem_region(dev->res.start, size); | |
1da177e4 LT |
617 | } |
618 | ||
619 | EXPORT_SYMBOL(amba_driver_register); | |
620 | EXPORT_SYMBOL(amba_driver_unregister); | |
621 | EXPORT_SYMBOL(amba_device_register); | |
622 | EXPORT_SYMBOL(amba_device_unregister); | |
623 | EXPORT_SYMBOL(amba_find_device); | |
624 | EXPORT_SYMBOL(amba_request_regions); | |
625 | EXPORT_SYMBOL(amba_release_regions); |